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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '627e0a8143af82c387a4f776c82838828fb0f0a3f334e4a61b9bbc18b833b27d' 
  AND token = '6fB5D4CKvzCsguLL3WKQSmYNxvKmWlURINx1VRz05zU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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