Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a250342c9e2bd5746063e9bbfa17fa80bbfce70e6055d1560728cbdbdb39913' 
  AND token = 'EnLj5N3ACebG1wb6lAUNz7I51QEEAc+R3YdB92vNQ/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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