Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c12bbdc6f204cec37988e9300a6c783c1c23393d94fc66dd2289e67f7b213d0' 
  AND token = '38U0YWY3EIq8O53cqN5kziLmVi8TzNbK0i9SKcE4Q8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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