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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ab98b4603bb9f9498edf1ad45f1044a905689d3cd2f934aaa613b3281e98e72' 
  AND token = 'PzEwxvVjEODqv2ExE7Y4vM5Ju4uwMMONLHu83oVFRh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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