SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ab159a58e56a07232c147dfcff6b13f707fa7a1e4bb478d0abb103c6c3cc3d5' 
  AND token = 'yVkCF+RYT7bNGM/JrTMHo2yggbhy+ujBZO8URHxW4O8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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