Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02e2d1ce9ff0826035a5c2dabbda870955e065845437487e9fa414b4d8e22dd6' 
  AND token = 'qLXtALV3et7v0yCGhf6NtYYJkxtmNKd+TLVpZiAYjAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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