Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52827b0b5a13e628c0dd2300d443a32e4cbb3934f592d35a5b41e44a21ea18a0' 
  AND token = 'pRFTgxxFZ+ZNW9jyoSeUIFN7MMz1GYOPJpgrhb0Sc/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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