Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca2b91806b764e298f18c5c3fc0f7058b6e46e70549a69fdeffcf3a806380ff0' 
  AND token = 'ORzBDqMKERKnz3WDAnnr5yyhMhUi1NuNB+J7ugpcMWc=' 
  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"
    }
  }
}