Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '825363f6f20aa55acf25326d8441a80d3adf1011e525b0cae12e92b9a7842b09' 
  AND token = 'oqZqJVPn6duPeFSqyv7VqJGAkSYkLuy92ALGnpRfjA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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