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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b3fd8430ed3440026e4b0f38af4581827b821a5f7f642365d6520db6ace9944' 
  AND token = '/YVdCBU/1we+rQXRtznaXEz6GyTBb1PMDn/7vWdAfjA=' 
  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"
    }
  }
}