SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b96d063735741077ee89a951e2861efdcc7cb26494dc7071f1c154b9334f566' 
  AND token = 'pVwEqpSskMuiGJGrpfmU2WRguB531YcT+OUNT+RqURA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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