SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8988341317d17240ff623633bb5ccd073360efcdbf27aa484ac9aa46392f8126' 
  AND token = 'rbdTw4c+8rYKFQx5mUALgQveOEV/q6jx/Qjp3gXlux0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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