Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6898d7427af4efeb3b381ab3483c21809b1e03b76694e6ae9d30a1716d2b84a0' 
  AND token = '/aHmM/ArsV7VJsnVtAOAlKQxFLBrCtc5qqHZsioDSAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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