Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f30d7f95ba3606370299a09eb3e3ea749d6d1afce9895d18b187a27910537c5' 
  AND token = 'NnXDcqndkR7Km/e0GOk6qlhRlQnZGGAIYKSck3EcWK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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