Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f74e59c0868491e273aef21a8cec0b80845d1121ca84232f98c47387a3d75807' 
  AND token = 'YfcJc8Ug71NKoYRbIJZ7J+ydHKpQ1q/jvsL0BZerPe8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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