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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3889c82a80b60a9a7c020fd093326a58bee9441c4b77d7757764065a9367024c' 
  AND token = 'qQEzNkL7WreNLMLWJOBk5d4Hq7hTlB/Y+8PzkWW9AMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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