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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd13f89e9d6e2d160b3438780b61b69744c07d491b90bf6d81b84993632b5b266' 
  AND token = 'USxj8v06mXh0P9Ekg3RVhI2v6dxKfm5GWbvc6UYXom4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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