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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33ec6e4e97974cb277bae33340549ebc07d2d29f60cf67c6dfb2863ea89687f1' 
  AND token = 'YKNBir+QR2LiozNNO/oeKJzUZuHb3ae+JiOdISVxdLI=' 
  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"
    }
  }
}