SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d5cdb5bbd1f699604ebbe9885191ba5b4ea0f772a7aa8134aa0c27e793b682f' 
  AND token = 'HwisvtlKOKnZ3BtsU/ixcjEUZ92v8b4Vo5TpJ9K2/GY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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