Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23a71f3f5efc3a1bc2a48c4fd69ef3b1bf6a07c034eca1b567d22d226dd0da9d' 
  AND token = 'mrPmKWyohhoFifhAHGI5pYYcMCHULiU23SVrYn2BPQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00135

JSON explain

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