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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da58c5562e5246a36bb909150b7bd93900804b0ab043d7286b98082410923aae' 
  AND token = 'rS30oICw3/CIMZ03u90BpImO429VZJsHb101qgsk4AQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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