SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdf78cba99f7a21cf94a5141905c21f8d7bbe238e3a2d139d6bbd9fe6b8c6c48' 
  AND token = 'U0/gIztY5wVarHxWRNQAXc1XHKl21bJmxKU6vW7Ahsg=' 
  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"
    }
  }
}