SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4d194fd801af0847164d1f145769aa58bb0a3089d9d6c88cf5e7f3dd1d06f30' 
  AND token = 'hbFgn+Vz/YuF01PoO+hNfb1jwg/0MGqfaGjlLaVgX3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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