Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08bbe78d76e0a5265a33c90ef03f2c0e885402e9d846eeee60e0be0345cea1ee' 
  AND token = 'Y5mdTbKLCsIyluq/MFBhJaCDNDtXcYokCbi7Z7tBX/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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