Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50eb9d429270b41b2495137f8a3845850cbd72e043e5c10608b59aafb3518cdc' 
  AND token = '3Rcd2JbfVcFS/wYBckNQRip8+N2Dsun6JNL12wy3oIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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