SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f202a7a10d74b42c513499f3269c0c7f442da57687fdc5c5035b8ee3be7df412' 
  AND token = 'ipzXQ1sl6RyqFH5hEgg60n8jVJNImjVJ8WlZ2bCLLZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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