Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '850cc80c22da9a67c32098db95fe929f736b01666ac71fb7e6ae9a067e1836e7' 
  AND token = '05FBZ1VdVS/wJwhfTRJKSCCGfaZ3Sm+Ytl3OtLfy83s=' 
  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"
    }
  }
}