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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89ff000ddb7d6f270b06c94e386b67d7f19cbe4ce34a3b5940b7a11a94f3e675' 
  AND token = 'IUgWgmi9otEkGT0WPxxcnEt7GOB6egZpXSW9DrKpbnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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