SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fce50e67989d7ae2532a58b721ae4de749d28cb1ca5e3ac0376513cd3ef37819' 
  AND token = '+MA4wLrPshWl0RW0PAm4jvNkGUs7TDg2qz2aZVY6ZMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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