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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30211123a91ba30e58f4cd8338c8320e9c131b9b5b799e08cda8c0f517a42406' 
  AND token = 'uYBz9EIw1o2aGC2reTNEvdNMVQe89XGss1zcGHHZbPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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