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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a26ef8b736d41b47c92950a25d7c84cb414fe5a6cf7330934c5e2f565b5b6808' 
  AND token = 'onpwVKDHmjuWPVN1A9QZ62RR22/pAEmPeD6N5x9WTW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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