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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81f654b7767032835805cea4ed3b13ab8a723f09ed5f505e675fc89eb525815f' 
  AND token = 'IbZG7jZu6n2WkKfa/QrkaSyL9ckZV/vV7qP9fb+bw2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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