Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a66c98c71bcb78ac32a1beb1434d0a83e0b53a4186fa244a09be6c42c5fc5b2' 
  AND token = 'QryqYP1OA4FvAhX2slkwXa/4+yDY6GXWp2N/pzguewY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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