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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2ce3d0016d3c8b0cbfcbaf11f5c1f4a53edbe046aa9e8db400bc87f25deba04' 
  AND token = '4Q4cTXlnHo647DH1MKyL/t5Z+T5zqR2V7cQzOes2FJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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