Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4399c254b29512ccd9ce56872dbd0fdba3a4d749d7e3144b0b85ec36a6c26263' 
  AND token = 'crLkch7d6L34k3lDTN8vQl3hhHNZpCj1QH6WhCHijVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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