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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a71c8ae7ad59db0fd61b8536fb7a8ebe93fe7d99bd7cf4e4c40ec0d2f7be23f1' 
  AND token = 'UcjU0c0VBP7E9ukMo110bhiCEEaQEXMZMLalM6na6lw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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