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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '235f655235dbb9dd500e1d72bf0e1aa77ebd81f4712b41d612407dc7f192bc7a' 
  AND token = 'ueoEKqqk3k/RF+9gQslf4IgronEBDoPdZCF9It9to3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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