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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6581ab44f7b9d433503f7edcf2bb944b3c3caf278adb7ee63650bbdb170d0c1' 
  AND token = 'DbrguxTlKmr5w4aHOSUO1T0KlEuXGKf2vmCyTy2TC48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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