Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '192cbe04b000291c3c3813daa7ac5a2b5d092acac186ca6ebd3e0f217ea91868' 
  AND token = 'XPVA3qulcMn+mPVdjPPBNh4OasQqf604/IWkdqH+GHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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