Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71af32251d98bb5f97e898b20c04fe42a5ba9e0e426fbfae2d96cb0726217dcc' 
  AND token = 'boUqBMRe2tBkuWPRKWWxdyniMcFi++JBXpKh7ZEn1ls=' 
  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"
    }
  }
}