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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ea9286982fb5c21e613ca8a91da1ab1e40d70cb6f5a6dd8b0f3b83b431f482c' 
  AND token = 'XiR232fav98F9wSYjOcKag5DGGtqNVY7py63jHYQpa8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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