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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7b9d534f8477c47d112312318af8f37fd7f1840a812db83b986b1715231a0c9' 
  AND token = 'KqkPuYp0T/scb1o2ch7M+CDT+Enr0YfEDQf/HO+sQew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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