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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccdeb400f0f3bd4647b474a809a4a89f7bc9a8e2136102977d36b10a9cf7906d' 
  AND token = 'kzvlRyHyd1rRnzaxW2S01MTvCjskqJm7rFl2ph7gqYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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