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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f325a5666e2fe7f31927df41660af96b5cae483a32075288160077dc21069ab' 
  AND token = '9un9iKVuCgkIcnMQZVTdQH5WO0ceUYPzoJ8HLw7AE7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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