Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad3d91a4fe0e43faaff9435223ea7135dfe1c764b7675eed9b13413cc03e29aa' 
  AND token = 'I1BLwJG9xoJS3dtHPZFJ63DMArfBw08GVTLw8+sQazc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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