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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cff53d2165d0e2d7aa0d5dcef7b22e1b6242dea5fcd2cc54f3bc2cd6efb51f36' 
  AND token = '+YAkSEEwI7jQxtgb4VA9LDEwqSVgYvSP/GsXv6dTx0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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