Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2fcd50ba520304ed9e65bf01d44d54878e082efe88ddf41f78e30e1e1b5a21a' 
  AND token = 'CJV2g07biBAMI912PMRjRsvl9wcAzIdJCSHvWOFCGOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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