Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd21e3d509d285108520f87ce9d7f23f58092dc352886a571a4a20d920b580242' 
  AND token = 'ajLpLPGFM16+TAJMniuwy9T0boCQAoWLuGTOg+2yfHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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