Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5204a1c4ee91a92e3d83d41100a683b85af01e0a7aa62c70d9113b8013e6b6e' 
  AND token = '6VJRxM6GvuXVjaFaCjYoFjeXG7B3IzGmdCa/Aql7Ios=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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