Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e508114cc5ed38c3436140f4f4cfcfa4f497fd73d92718219cf76f88dc8de736' 
  AND token = 'BNH+NEi16VlsieMxNrYVEszCtpxFQsgwGwrmV4ej+ZQ=' 
  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"
    }
  }
}