Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6662054f4dcce6c77927a5f8c8864d51fcc0ee88a573150b785e515d72bd51e5' 
  AND token = 'cWyvYf1FgKfkpj1cA9kP335U1GQWAx4rTtz89D5iW5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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