Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5d76e59d11bb55f3fea3e5adc0d0466c33ce21488145a506d70b178e593d79d' 
  AND token = '2AmTpgYvDl7GiVcTLDyMavizm8/d+PiqOFy5gJkoD+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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