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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '261919afe1d9f7b4665875e3b8e72805517fc05f1cd7a94727c1084a4efe9640' 
  AND token = 'ZvFurCYezucn/BaBAD17+X3y1ZaUZWL1fYnl8lvyx4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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