Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3264e636caae33070676e2ca2f649f667f0643dc8246a2e1a3f1272bc37fbb55' 
  AND token = '88PAfS0BJmdux8kOv6eUeBn/sw7msC+Cf3/m/PG4jMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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