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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41d8fe3f8feb04f03a7de5035a76648f57009f68283cca5e7f041abdf61a4a6c' 
  AND token = 'rXJdbMEBrSZS1W+DU/adUQXponyMk21vlIiQEBWVCiw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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