SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92dd6f16f419aa8c7c11832f96f64805edad241c6414346e16fa39cf47d0179e' 
  AND token = '1T5vFXewL5/kS/0PSWpcUi0fMG1E4465WSypq1ooJ90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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