Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b478ed2f90f95f919ab2e2c47d0c5edf922c06677c5666374ec4b419f6ac777' 
  AND token = 'ZMXTjka/NONBEkWEvTBTOwFsUwddg+3+cZ6EhClT1yc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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