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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8120e9238f45973d9aa56c422230a7d1808e9ced184efe7b7c0c5ff953bfdce2' 
  AND token = 'Y6fyr1OkEQpKKy0gI6o5/0TrcKmYNjQ+ZdNR80RqjOY=' 
  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"
    }
  }
}