SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1e57e581dc876fb6b9d49e5250f4f6837e356949f85bb5fddbcf21bd4e53e75' 
  AND token = 'LS+yr1CRVrjHWYtpJNscP79+YaN0v6yVqaLgho84qzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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