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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09c50205e3e769ce0585f4ae53af98891e17450c6c565a2ef3dca39e6b532080' 
  AND token = '8vq5UyrP0YTTk53IwJW02yQ/3X0DLdTCkubkt5eAI/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}