Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e86ad1d6b67d788013848f03e0cdb1d28570c0c375f95e9eb37dc687e6a904f' 
  AND token = 'WODR9SMfe1jVqIRAYPnm4Y/CjkhmlcfHsUIB8v/riyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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