Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8df02b06719e211cac78af1880cfa9a89edc3c4ccf80c9eb660e3e629481a79' 
  AND token = 'waJhUPYFDrhEdoWunYmMs2rrBxZ7QN7XG9Y8gT3mM2s=' 
  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"
    }
  }
}