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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd003522233b23b49b8cfbf351f30f63b00cf1e22c5acd0e9afb39af013909d5' 
  AND token = 'yw7SQU9GdusEPN70mucZQ9gaDDEdgGy2J70afK5i2A0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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